Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, -1), (1, 0, 0), (1, 1, 1)}.
A150126
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, -1), (1, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =70a(5) =258a(6) =964a(7) =3650a(8) =13988a(9) =53912a(10) =209250a(11) =815694a(12) =3191352a(13) =12528050a(14) =49293582a(15) =194381732a(16) =767871008a(17) =3037741072a(18) =12033319364a(19) =47718165076a(20) =189406078340a(21) =752422637326
External references
- oeis: A150126